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1 <br /> 1 <br /> CC <br /> C. 1�11:110FOIIIII"I' <br /> Engineering and GOnStructlOn, InG <br />' July 5, 1994 <br /> Job No 93036 <br />' Conoco Inc <br /> Room PO - 3038 <br /> P O Box 4784 <br />' Houston, TX 77210-4784 <br /> ATTENTION- Ms Linda Thompson <br /> Project Manager - Remediation Technology <br /> SUBJECT Quarterly Monitoring Report <br /> Soil Remediation System <br /> April - June 1994 <br /> Former Econo Gas Station <br /> Stockton, California <br /> Dear Ms Thompson- <br /> This report presents the status of the soil remediation system located at Conoco Inc 's (Conoco) former <br /> Econo Gas station, 4325 East Washington Street, Stockton, California between March 31, 1994 and June <br /> 30, 1994 Sampling observations and analytical results are reported herein for this quarter only <br /> A Sunriver technician visited the site on a weekly basis Typical activities that were performed during <br /> a visit included equipment inspection, instrument calibration, influent and effluent soil vent gas <br /> concentration measurements, and control system adjustments A hand-held flame ionization detector <br /> (FID) was used by the technician to measure the vent gas hydrocarbon concentrations A site visit sign- <br /> in log was maintained Laboratory results and chain-of-custody forms are attached in Appendix A <br />' The soil remediation system consists of a series of vapor wells, a vacuum blower, and a thermal <br /> incinerator The removal rate of the soil remediation system is approximately 100 standard cubic feet <br /> per minute The operating efficiency (actual operating time versus the total time in the reporting period) <br />' of the system was 78 percent <br /> I <br />' CONOCOV3036136QS0I94 REP <br /> 4501 D 0 H,ir,i wmfr f3rentwood G9Iifoi nii 9451,3 ■ (510) 516-0162 ■ FAX (510) 516-2649 ■ _otiti actor,� License # 620479 <br />